Barrel Bushing for 1911 Government Model, all calibers. Machined from stainless steel with natural finish. Flange is .100" thick and matches perfectly with the 10-8 Spring Plug or most Colt/GI style plugs. Flange has carry bevel machined into outside edge. OD is nominal .702", ID (bore) is nominal .579" with straight bore. Typically requires some fitting in most Government Model style slides, amount of fitting required will vary by individual slide/barrel combination.